US Bridges

Ia 13 over Buffalo Creek

Good

Linn County, Iowa · 0.1 Mi. N of S JCT SR D62 · Structure no. 000000000033691

Built
1976
49 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
205 ft
3 main spans
Daily traffic
4,970
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 13 over Buffalo Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 13 over Buffalo Creek in Linn County, Iowa. It was built in 1976, so it is 49 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,970 vehicles a day, roughly 13% of them trucks, projected to reach 4,970 by 2044. The structure is 205 ft (62.5 m) long and 47 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesIa 13
CrossesBuffalo Creek
Location0.1 Mi. N of S JCT SR D62
RouteState Highway 13
StateIowa
Coordinates42.27939, -91.52294
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.8 US tons
Inventory rating45.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length205 ft (62.5 m)
Longest span73 ft (22.3 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,970 (2022)
Projected traffic4,970 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 13 over Buffalo Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Ia 13 over Buffalo Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Ia 13 over Buffalo Creek carry?

About 4,970 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Ia 13 over Buffalo Creek?

The structure is 205 ft (62.5 m) long with a longest span of 73 ft (22.3 m) and a deck 47 ft wide.

Who owns Ia 13 over Buffalo Creek?

It is owned by the State Highway Agency.